Domanda 400, Principles of Flight - ATPL - Airline Transport Pilot license

A reduction in the blade section pitch angle towards the tip to reduce the chances of retreating blade stall.
The difference between the blade section pitch angle and the angle of attack at any point along the blade.
A reduction in the blade section pitch angle towards the tip to delay the effects of compressibility.
A reduction in the blade section pitch angle towards the tip to give a more even distribution of lift along the span of the blade.